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authorRadim Krčmář <rkrcmar@redhat.com>2015-10-30 15:48:20 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2015-11-04 16:24:34 +0100
commit0669a51015c58b1f036030743a0c0781eb63867f (patch)
tree335bbe1aa81071f50d05c9af247abad44fad72c0 /arch
parentc75efa974e013640496620f26f0b532cb5cb17f9 (diff)
downloadlinux-0669a51015c58b1f036030743a0c0781eb63867f.tar.gz
KVM: x86: zero apic_arb_prio on reset
BSP doesn't get INIT so its apic_arb_prio isn't zeroed after reboot. BSP won't get lowest priority interrupts until other VCPUs get enough interrupts to match their pre-reboot apic_arb_prio. That behavior doesn't fit into KVM's round-robin-like interpretation of lowest priority delivery ... userspace should KVM_SET_LAPIC on reset, so just zero apic_arb_prio there. Reported-by: Yuki Shibuya <shibuya.yk@ncos.nec.co.jp> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/lapic.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 168b8759bd73..ecd4ea1d28a8 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1918,6 +1918,8 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
kvm_make_request(KVM_REQ_EVENT, vcpu);
if (ioapic_in_kernel(vcpu->kvm))
kvm_rtc_eoi_tracking_restore_one(vcpu);
+
+ vcpu->arch.apic_arb_prio = 0;
}
void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)